<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - systemctl is-enabled scales poorly with many units" href="https://bugs.freedesktop.org/show_bug.cgi?id=72611#c7">Comment # 7</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - systemctl is-enabled scales poorly with many units" href="https://bugs.freedesktop.org/show_bug.cgi?id=72611">bug 72611</a> from <a class="email" href="mailto:david@davidstrauss.net" title="David Strauss <david@davidstrauss.net>"> David Strauss</a> <pre>Okay, so I think I understand the issue now. If you have a ton of units, and they're mostly enabled, checking is-enabled scales O(2*n). Here's the problematic path in our case, with units in /etc/systemd/system: (1) find_symlinks_fd() iterates through everything in /etc/systemd/system (2) When we find the multi-user.target.wants directory, we recursively call find_symlinks_fd() on it. (3) We look for symlinks back to the unit. This isn't at all unique to recent systemd versions; it's just a new problem we're seeing with our increasing scale.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>